Double murder in home late row.

An 18-year-old wanted in a Pennsylvania double homicide and the apparent abduction of 14-year-old girl was captured last night after a car he was driving crashed in Indiana following a police pursuit.

State Police 1st Sgt Dave Bursten said David Ludwig, 18, was apprehended after the car he was driving crashed about 20 miles west of Indianapolis, Indiana, following a pursuit by State Police.

Bursten said Ludwig was found with the missing girl, 14-year-old, Kara Beth Borden, a daughter of the killed couple, and she was unharmed.

"He's in custody and we have the girl," Bursten said.

Earlier yesterday Kara's sister said she had seen the man kill her father.

Police said David Ludwig killed 14-year-old Kara Beth Borden's parents, Michael and Cathryn Lee Borden, after a row about her arriving home late.

Kara was last seen after the shootings on Sunday morning at the family's home about 60 miles west of Philadelphia.

Kara Beth's sister Katelyn, 13, said Ludwig shot her father and mother after they had been arguing for about an hour, according to police.

"Katelyn Borden saw David Ludwig with a handgun pointed toward her father and Katelyn saw David Ludwig pull the trigger, heard a gunshot, and then she ran into the bathroom," police court papers said.

She heard a second shot, presumably the one that killed her mother. Ludwig then ran through the house calling for Kara. The couple's nine-year-old son ran to neighbours, who called the police.

"We think they're boyfriend and girlfriend," said Police Chief William Seace.

"The young girl was out during the night, came home, and her parents confronted her."

Lancaster County Coroner Gary Kirchner said that the victims, who were both 50, apparently died of single gunshot wounds to the head.

"It's completely insane, completely insane," Mr Kirchner said. "This isn't a Romeo-and-Juliet deal; this is far worse than that."

It was the second violent incident in a week in normally quiet Lititz, a Lancaster County, Pennsylvania, village known for quaint shops, local artists and Sturgis Pretzel House, which bills itself as America's first pretzel bakery.

On Tuesday, police shot and killed Daniel Faust, 23, hours after he shot an officer who had gone to his home with a traffic warrant.

The officer, Jevon Miller, was critically wounded.

Mike Borden worked for a printing company, and the children were home-schooled, he said.

Mr Sherman said the family knew Ludwig through a home-schooling network.

Stephanie Mannon, 16, said Ludwig and Kara Borden had been seeing each other secretly.

"Their parents didn't approve of them being together."